RE: [PWE3] PWE3 question

[Shahram Davari <Shahram_Davari@pmc-sierra.com>]

Eric, 

Thanks for your insightful reply. A few minor comments are in-line

-Shahram

> -----Original Message-----
> From: Eric Rosen [mailto:erosen@cisco.com]
> Sent: Friday, May 10, 2002 11:33 AM
> To: Shahram Davari
> Cc: 'Sasha Vainshtein'; 'pwe3@ietf.org'; Danny McPherson (E-mail);
> 'Andrew G. Malis'; Neil. 2. Harrison (E-mail)
> Subject: Re: [PWE3] PWE3 question 
> 
> 
> 
> Our original assumption long  ago was that no one with a  
> clue would want to
> use a  scheme in  which each pseudowire  lays down  state in 
> the  P routers.
> Otherwise it would be as bad (unscalable) as ATM. 


Sure, but what if the Provider network is small or supporting very few
PWE3 connections. 

> 
> Given that  one wants instead to  tunnel the pseudowires, 
> there  needs to be
> some  applicable  signaling protocol  which  is  mandatory  
> to implement  in
> devices  that set up  tunneled pseudowires.  This is  
> necessary in  order to
> ensure multi-vendor interoperability.

But for TE purpose, those devices need to implement non-LDP
protocols. They might as well use them for setting up 
PWs too.
 
> 
> If  someone  wants to  standardize  a  method  for setting  
> up  non-tunneled
> pseudowires, there is nothing to stop them, and no particular 
> reason why LDP
> should be involved.  
> 
> I imagine the networks which want to do non-tunneled 
> pseudowires will be the
> same  networks which  have deployed  CR-LDP, ITU's  standard  
> MPLS signaling
> protocol,

1) This method could be independent of the signaling protocol
2) Surprise: CR-LDP is IETF's standard too. 

> so you may wish to  look into that, perhaps within 
> the auspices of
> ITU.

I don't see any strong connection to ITU here.

> 
> There is  already an  i-d proposing  to use RSVP-TE  to set  
> up non-tunneled
> pseudowires, though  I did try to  discourage the authors on  
> the grounds of
> the assumption in the first paragraph above. 
> 
> 
> 
> 
> 
> 
> 

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